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SOLAR/1038-79/05 




Monthly 

Performance 

Report 



SADDLE HILL TRUST 

LOT 36 

MAY 1979 



kU.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 

SADDLE HILL TRUST 
LOT 36 

MAY 1979 

I. SYSTEM DESCRIPTION 

Saddle Hill Trust Lot 36 is a single- family residence in Medway, Massachusetts. 
Solar energy is used for space heating the home and preheating domestic hot 
water (DHW). The system has an array of flat-plate collectors with a gross 
area of 315 square feet. The array faces south at an angle of 58 degrees to 
the horizontal. A 60 percent glycerol solution is the transfer medium that 
delivers solar energy from the collector array to storage; water is the 
transfer medium that delivers solar energy from storage to the space heating 
and hot water loads. Solar energy is stored in the basement in a 750-gallon 
storage tank. The tank is made of steel and lined with polyurethane. Preheated 
city water is supplied, on demand, to a conventional 80-gallon DHW tank. When 
solar energy is insufficient to satisfy the space heating load, an oil furnace 
provides auxiliary energy for space heating. Similarly, a conventional elec- 
tric 80-gallon DHW heater provides auxiliary energy for water heating. The 
system, shown schematically in Figure 1, has three modes of solar operation. 

Mode 1 - Collector- to-Storage : This mode activates when the collector tempera- 
ture is either more than 40°F higher than storage temperature or higher than 
150°F. Pump PI is on. Solar energy transfer takes place through a heat 
exchanger located inside the storage tank. 

Mode 2 - Storage-to-Space Heating : This mode activates when there is a 
demand for space heating, storage temperature is 70°F or higher, and house 
temperature is lower than storage temperature. Pump P3 is on. Solar energy 
transfer takes place through a heat exchanger located inside the air duct. 

Mode 3 - Storage-to-DHW Tank : This mode activates when storage water is 5°F 
higher than water in the DHW tank. Pump P2 is on. Solar energy transfer 
takes place through a heat exchanger located inside the DHW heater. 



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II. PERFORMANCE EVALUATION 



INTRODUCTION 



The site was occupied in May and the solar energy system operated continuously 
during the month. Total solar energy collected was 4.0 million Btu and the 
total solar energy used was 3.0 million Btu or 75 percent of the collected 
energy. Stored energy increased by 0.044 million Btu and storage losses 
amounted to 0.92 million Btu. Solar energy satisfied 84 percent of the DHW 
requirements and 58 percent of the space heating requirements. The solar 
energy system provided an electrical energy savings of 2.7 million Btu and a 
fossil fuel energy savings of 0.072 million Btu. 



WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 
11.6 million Btu for a daily average of 1186 Btu per square foot. This was 
below the estimated average daily solar radiation for this geographical area 
during May of 1274 Btu per square foot for a south-facing plane with a tilt 
of 58 degrees to the horizontal. The average ambient temperature during May 
was 61 °F as compared with the long-term average for May of 59°F. The number 
of heating degree-days for the month (based on a 65°F reference^ was 165, as 
compared with the long-term average of 218. The number of cooling degree- 
days was 41, as compared with the average of 20. 



THERMAL PERFORMANCE 

System - During May the solar energy system performed approximately the same 
as expected. The expected performance was determined from a modified f-chart 
analysis using measured weather and subsystem loads as input. Sclar energy 
used by the system was estimated by assuming that all energy collected would 



be applied to the load. Actual solar energy used was 3.0 million Btu versus 
an estimated 3.2 million Btu. System total solar fraction was 83 percent 
versus an estimated 88 percent. 

Collector - The total incident solar radiation on the collector array for 
the month of May was 11.6 million Btu. During the period the collector loop 
was operating, the total insolation amounted to 8.3 million Btu. The total 
collected solar energy for the month of May was 4.0 million Btu, resulting 
in a collector array efficiency of 34 percent, based on total incident 
insolation. Solar energy delivered from the collector array to storage was 
4.0 million Btu. Operating energy required by the collector loop was 0.10 
million Btu. 

Storage - Solar energy delivered to storage was 4.0 million Btu. There were 
3.0 million Btu delivered from storage to the DHW and space heating subsystems. 
Energy loss from storage was 0.92 million Btu. This loss represented 23 
percent of the energy delivered to storage. The storage efficiency was 77 
percent: This is calculated as the ratio of the sum of the energy removed 
from storage and the change in stored energy, to the energy delivered to 
storage. The average storage temperature for the month was 137°F. 

DHW Load - The DHW subsystem consumed 3.0 million Btu of solar energy and 
0.53 million Btu of auxiliary electrical energy to satisfy a hot water load 
of 1.4 million Btu. The solar fraction of this load was 84 percent. 
Losses from the DHW subsystem were 2.1 million Btu. The DHW subsystem 
consumed a total of 0.18 million Btu of operating energy, resulting in an 
electrical energy savings of 2.8 million Btu. A daily average of 60 gallons 
of DHW was consumed at an average temperature of 144°F delivered from the 
tank. 

Space Heating Load - The space heating subsytem consumed 0.04 million Btu of 
solar energy and 0.51 million Btu of auxiliary fossil fuel energy to satisfy 
a space heating load of 0.74 million Btu. The solar fraction of this load 
was 58 percent. The space heating subsystem consumed a total of 0.02 
million Btu of operating energy, resulting in a fossil fuel energy savings 
of 0.07 million Btu. 



OBSERVATIONS 

Adjustments were made to the DHW control system on May 24 to improve pump 
regulation and reduce power consumption. 



ENERGY SAVINGS 

The solar energy system provided an electrical energy savings of 2.7 million 
Btu and a fossil fuel energy savings of 0.072 million Btu. The DHW subsystem 
provided an electrical energy savings of 2.8 million Btu. The space heating 
subsytem contributed a fossil fuel energy savings of 0.072 million Btu. 



III. ACTION STATUS 



No items pending. 



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